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Fuel Filter - Patent 8114278


This application is U.S. National Stage Entry of international patent application No. PCT/EP2008/050295, filed Jan. 11, 2008, designating the United States of America, the entire disclosure of which is incorporated herein by reference. Priority is claimed based on Federal Republic of Germany patent application no. 202007000746.9, filed Jan. 12, 2007, the entire disclosure of which is incorporated herein by reference.TECHNICAL FIELD The invention concerns a fuel filter according to the preamble of claim 1.PRIOR ART Fuel filters are known that comprise a housing and a filter medium. The housing comprises an inlet and an outlet wherein the filter medium is arranged between the inlet and the outlet. In fuel filters that operate by suction, i.e., with a pumparranged in the flow direction downstream of the fuel filter, fuel outgasses at the crude side of the filter medium. The gas bubbles collect at the crude side in an upper area of the fuel filter within the housing. For preventing that more and moregases collected in the interior of the housing, venting bores are provided that connect the crude side with the clean side downstream of the filter medium. The gases that are contained at the crude side can thus pass to the clean side. A disadvantageof this configuration is however that through the venting bores also dirt particles can pass from the crude side to the clean side and can damage components arranged downstream. It is an object of the invention to provide a fuel filter that can be operated in suction operation and that prevents too great a gas collection in the housing. At the same time, it is to be prevented that the coarse dirt particles reach thecomponents arranged downstream. This object is solved by the features of claim 1.SUMMARY OF THE INVENTION The fuel filter according to the invention comprises a housing with an inlet and an outlet. For cleaning the fuel a filter medium is provided that retains the contaminants contained in the fuel. In th

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